
Exact Size: 21 1/2 x 23 5/16 x 7/8 (21.5 x 23.3125 x.875) Nominal Size: 21 1/2 x 23 5/16 x 1 Quantity 6 Filtration Rating: MERV 10. Comparable to MPR rating 600 to 800, or FPR rating 5 to 6. Blocks and Captures: Dust, pollen, mold spores, pet dander, smog, dust mites, debris.